| 摘要 |
<p>A mold facing for producing a gas-permeable, nongassing thin porous, heat-conductive cladding of a centrifugal ingot mold for copper and its alloys comprises a suspension of a powdery material in a liquid dispersing agent of distilled water having a low lime content, evaporating without leaving a residue. The pulverulent material has titanium dioxide (TiO2) as the main constituent or the sole constituent, preferably with an average particle size of about 15 .mu.m. The suspension is free from binding agents and surface active agents. A process for cladding a centrifugal ingot mold using such a mold facing comprises initially preheating the mold and subsequently applying the mold facing composition by spraying on the inner wall of the centrifugal ingot mold rotating around its axis in form of a suspension free of binding agents and surface active agents as a thin layer of, as far as possible, uniform thickness of preferably 0.1 to 0.3 mm and subsequently evaporating the dispersing agent of the mold facing without leaving any residue to obtain a porous layer.</p> |
